CN112374663A - System and method for treating organic wastewater by three-dimensional electrocatalytic oxidation of liquid-solid fluidized bed - Google Patents
System and method for treating organic wastewater by three-dimensional electrocatalytic oxidation of liquid-solid fluidized bed Download PDFInfo
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- CN112374663A CN112374663A CN202011015037.3A CN202011015037A CN112374663A CN 112374663 A CN112374663 A CN 112374663A CN 202011015037 A CN202011015037 A CN 202011015037A CN 112374663 A CN112374663 A CN 112374663A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The invention belongs to the fields of chemical industry and environmental protection. The invention particularly discloses a system and a method for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed. And removing solid suspended matters in the organic wastewater through gravity settling and filtering equipment to realize wastewater pre-purification. Through aeration treatment, the catalyst and the organic wastewater are fully mixed, and the catalytic components in the electrolytic gas are effectively utilized. The efficient cracking of organic matters in the wastewater is realized through plate-frame electrolysis coupled with fluidized bed three-dimensional electrolysis. The acid-base property of the water is adjusted by adding a medicament, so that the discharge reaching the standard is realized. In the plate-frame electrolysis, the modes of current parallel connection and water flow series connection are adopted, so that the water quality circulation is enhanced, the mass transfer efficiency is improved, and the cracking of organic matters is promoted. Adding a particle phase catalyst in the fluidized bed electrolysis, greatly increasing the reaction area, strengthening mass transfer and further realizing the high-efficiency decomposition and removal of organic matters; meanwhile, the surface of the anode is provided with the protrusions, so that the catalytic coating can be protected, and the abrasion of fluidized particles can be inhibited.
Description
Technical Field
The invention belongs to the fields of chemical industry and environmental protection, and particularly relates to a system and a method for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed.
Background
The GDP of China in 2019 reaches 99 trillion Renminbi, which is increased by about 58 times compared with that before 30 years. Behind the rapid economic growth, the product yield in the heavy industrial fields of chemical industry, metallurgy, coal, cement, caustic soda and the like has exceeded more than 50% of the world. In order to maintain a benign balance of the ecosystem, the pollutants must be artificially disposed of. The organic waste water related to the invention is a very typical pollutant.
Organic wastewater is widely used in various industrial fields, including textile, pharmacy, pesticide, tanning, petroleum, chemical industry, coal, metallurgy and other fields. Organic wastewater is mainly treated by a biochemical process, so that energy in the organic wastewater can be recovered, and the method has the characteristic of low cost. With the development of industry, organic matters with various specific functions are created, and organic wastewater generated in the production process is difficult to treat through biochemical procedures or difficult to reach the water quality standard after treatment. This situation requires a physical-chemical pretreatment or an advanced treatment. These methods mainly include ozone oxidation, fenton oxidation, photocatalytic oxidation, wet oxidation, internal electrolytic oxidation, and electrocatalytic oxidation. The electrocatalytic oxidation technology has the advantages of compact device, small occupied area, no secondary pollution, high treatment efficiency and the like, and is rapidly developed in nearly 20 years.
At present, the problems of low mass transfer efficiency and high electrode cost mainly exist in the organic wastewater treatment by the electrocatalytic oxidation technology. In order to solve the problem, people propose to add three-dimensional particle electrodes between two-dimensional electrode plates, so that the specific surface area of the electrodes is greatly improved, the cost of the electrodes is reduced, and the mass transfer efficiency is improved. Chinese patent CN201620686031.1 discloses a device for treating landfill leachate by using three-dimensional electrodes, wherein aluminum-titanium alloy is used as an anode plate, stainless steel is used as a cathode plate, and coal columnar activated carbon is used as a particle electrode. The initial COD concentration is 1500ppm, and after the electrolytic treatment by adopting the technology, the COD removal rate is 70-93%. This patent adopts fixed bed structure, and rivers go into down and go out, and the long-term pile up the in-process of active carbon, can harden into the piece, and then block up the water flow. In addition, the fixed bed has short-circuit current, which causes the reduction of the electric energy utilization rate, the temperature rise of the electrolytic bath and the reduction of the service life of the electrode. The Chinese utility model patent CN202400887U discloses a three-dimensional particle electrocatalytic oxidation sewage treatment device. The anode adopts titanium alloy or graphite plate, the cathode adopts titanium alloy or stainless steel plate, solid catalyst is added in the reactor, and COD can be reduced from 4000mg/L to 1280mg/L through electrochemical treatment. However, in this patent, the particle electrode can rub against the anode during fluidization, reducing the anode life. Moreover, the titanium alloy is adopted as the anode material, so that the catalytic activity is very low, and the energy utilization efficiency is seriously influenced. Chinese patent application CN108423773A discloses a three-dimensional fluidized bed electrolysis apparatus and method suitable for circulating cooling water treatment. This patent adopts the column positive pole, and the external insulating annular perforated plate of positive pole. A fluidization chamber is arranged between the exterior of the insulating plate and the reactor shell, and a large number of conductive particle electrodes are arranged in the fluidization chamber. The particle electrode can inhibit the scaling of the cathode and maintain the good reaction state of the cathode in the fluidizing process. The plastic porous separator in this patent protects the anode from wear. However, the existence of the insulating porous plate can seriously affect the mass transfer of the electrolyte, and the performance of the unipolar particle electrode is generally lower than that of the bipolar particle electrode.
In summary, the electrocatalytic oxidation process has significant advantages in treating organic wastewater, but the current technology still has the problems of low mass transfer efficiency and high electrode cost. The existing three-dimensional electrolysis technology presents remarkable technical advantages, but has some outstanding problems: (1) the three-dimensional electrolysis of the fixed bed has the problems of caking and hardening of particle electrodes, influence on the flow of electrolyte, short circuit of current, heating of a tank body and the like. (2) Fluidized three-dimensional electrolysis has good mass transfer, but particle electrodes are prone to wear of the anode catalytic coating. The anode can be protected by adding a porous clapboard or a cloth bag, and the new problem of limited anolyte flow also occurs. Moreover, unipolar particle electrodes are generally less effective than bipolar three-dimensional particle electrodes. (3) At present, the field of electrocatalytic oxidation treatment of organic wastewater mainly focuses on the development of an electrolytic cell, and a systematic technology is lacked.
Therefore, the development of a novel systematic efficient electrocatalytic oxidation technology for treating organic wastewater has important significance through technological innovation.
Disclosure of Invention
Aiming at the problems, the invention provides a system and a method for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed, so as to realize efficient treatment of the organic wastewater.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed comprises a filtering section 1, an aeration section 2, an electrocatalytic oxidation section 3 and a water quality adjusting section 4;
the filtering section 1 comprises a gravity settling tank 1-1, a settling tank blow-down valve 1-2, a filter water inlet pump 1-3, a filter 1-4 and a filter blow-down valve 1-5;
the aeration section 2 comprises an aeration tank 2-1, an aeration tank blowdown valve 2-2, an aeration pump 2-3, a catalyst tank 2-4, a catalyst feed valve 2-5 and a catalyst feed pump 2-6;
the electrocatalytic oxidation chemical section 3 comprises a direct-current power supply 3-1, an electrolytic bath water feed pump 3-2, a plate frame electrolytic bath 3-3, a fluidized bed electrolytic liquid inlet valve 3-4, a fluidized bed electrolytic bath 3-5, a fluidized bed electrolytic liquid outlet valve 3-6, a gas-liquid separation tank 3-7 and a separation tank liquid outlet valve 3-8;
the water quality adjusting section 4 comprises an adjusting tank liquid feeding pump 4-1, an adjusting tank 4-2, a medicament tank 4-3, a medicament feeding valve 4-4, a medicament feeding pump 4-5, an adjusting tank liquid discharging valve 4-6 and a purified liquid conveying pump 4-7;
the liquid inlet of the gravity settling tank 1-1 is connected with an organic wastewater main pipe; a sewage outlet at the bottom of the gravity settling tank 1-1 is connected with a feed inlet of the settling tank sewage valve 1-2 through a pipeline; the discharge hole of the sedimentation tank blow-down valve 1-2 is connected with a sludge treatment main pipe; a vertical liquid baffle plate is arranged in the gravity settling tank 1-1; the water outlet of the gravity settling tank 1-1 is connected with the water inlet of the filter water inlet pump 1-3 through a pipeline; the water outlet of the filter water inlet pump 1-3 is connected with the water inlet of the filter 1-4 through a pipeline; a filter screen or filled with quartz sand is arranged in the filter 1-4; the sewage outlet at the bottom of the filter 1-4 is connected with the feed inlet of the filter sewage valve 1-5 through a pipeline; the discharge ports of the filter blow-down valves 1-5 are connected with a sludge treatment main pipe; the water outlet of the filter 1-4 is connected with the water inlet of the aeration tank 2-1 through a pipeline;
the air outlet of the aeration tank 2-1 is connected with a harmless gas emptying header pipe; the catalyst feeding port of the aeration tank 2-1 is connected with the discharging port of the catalyst feeding pump 2-6 through a pipeline; the feed inlet of the catalyst feed pump 2-6 is connected with the discharge outlet of the catalyst feed valve 2-5 through a pipeline; the feed inlet of the catalyst feed valve 2-5 is connected with the discharge outlet of the catalyst tank 2-4 through a pipeline; the liquid outlet of the aeration tank 2-1 is connected with the water inlet of the water feeding pump 3-2 of the electrolytic bath through a pipeline; a vertical guide plate is arranged in the aeration tank 2-1; a sewage discharge outlet at the bottom of the aeration tank 2-1 is connected with a feed inlet of the aeration tank sewage discharge valve 2-2 through a pipeline; the discharge hole of the aeration tank blow-down valve 2-2 is connected with a sludge treatment main pipe; an aeration valve is arranged in the aeration tank 2-1; the air inlet of the aeration tank 2-1 is connected with the air outlet of the aeration pump 2-3 through a pipeline; the air inlet of the aeration pump 2-3 is connected with the air outlet of the gas-liquid separation tank 3-7 through a pipeline;
the water outlet of the water feeding pump 3-2 of the electrolytic tank is connected with the water inlet of the plate frame electrolytic tank 3-3 through a pipeline; liquid diversion ports which are diagonally arranged are arranged in the plate frame electrolytic cell 3-3; the water outlet of the plate frame electrolytic tank 3-3 is connected with the liquid inlet of the fluidized bed electrolytic liquid inlet valve 3-4 through a pipeline; the anode of the plate frame electrolytic tank 3-3 is connected with the anode of the fluidized bed electrolytic tank 3-5 through a conductive copper beam; the cathode of the plate frame electrolytic cell 3-3 is connected with the cathode of the direct current power supply 3-1 through a conductive copper beam; the liquid outlet of the fluidized bed electrolytic liquid inlet valve 3-4 is connected with the liquid inlet of the fluidized bed electrolytic tank 3-5 through a pipeline; a granular phase catalyst is arranged in the fluidized bed electrolytic tank 3-5; the anode of the fluidized bed electrolytic bath 3-5 is connected with the anode of the direct current power supply 3-1 through a conductive copper beam; the cathode of the fluidized bed electrolytic bath 3-5 is connected with the cathode of the direct current power supply 3-1 through a conductive copper beam; the liquid outlet of the fluidized bed electrolytic bath 3-5 is connected with the liquid inlet of the fluidized bed electrolytic liquid outlet valve 3-6 through a pipeline; the liquid outlet of the fluidized bed electrolysis liquid outlet valve 3-6 is connected with the liquid inlet of the gas-liquid separation tank 3-7 through a pipeline; the liquid outlet of the gas-liquid separation tank 3-7 is connected with the liquid inlet of the liquid discharge valve 3-8 of the separation tank through a pipeline; the liquid outlet of the separation tank liquid discharge valve 3-8 is connected with the liquid inlet of the adjusting tank liquid feeding pump 4-1 through a pipeline;
the liquid outlet of the adjusting tank liquid feeding pump 4-1 is connected with the liquid inlet of the adjusting tank 4-2 through a pipeline, and the medicament inlet of the adjusting tank 4-2 is connected with the medicament outlet of the medicament feeding pump 4-5 through a pipeline; a liquid inlet of the medicament feeding pump 4-5 is connected with a liquid outlet of the medicament feeding valve 4-4 through a pipeline; the liquid inlet of the medicament feeding valve 4-4 is connected with the liquid outlet of the medicament tank 4-3 through a pipeline; a stirring paddle is arranged in the adjusting tank 4-2; the water outlet of the adjusting tank 4-2 is connected with the water inlet of the adjusting tank drain valve 4-6 through a pipeline; the water outlet of the regulating tank drain valve 4-6 is connected with the water inlet of the purified liquid delivery pump 4-7 through a pipeline; and the water outlets of the purified liquid delivery pumps 4-7 are connected with a standard discharge main pipe.
The plate frame electrolytic tank 3-3 is provided with a heat exchange jacket, and a heat exchange medium is water or air; the fluidized bed electrolytic tank 3-5 is provided with a heat exchange jacket, and a heat exchange medium is water or air; a liquid outlet at the top of the fluidized bed electrolytic bath 3-5 is provided with a porous filtering membrane; the pore size is less than 100 microns. Heat is generated during the electrolysis process, which causes the electrolyte to heat up and be removed in the form of a heat exchange jacket. The porous filtering membrane is arranged, so that the catalyst can be prevented from being flushed out of the reactor.
The invention relates to a method for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed based on the system, which specifically comprises the following steps:
sending the organic wastewater into the gravity settling tank 1-1, and performing gravity settling to obtain supernatant and sludge; the sludge is discharged through a blow-down valve 1-2 of the settling tank and is sent for treatment; the supernatant is sent into the filter 1-4 through the filter water inlet pump 1-3 to obtain filtered supernatant and filtered sludge; the filtered sludge is discharged through the filter blow-down valve 1-5 and is sent for treatment; the filtered clear liquid is sent into the aeration tank 2-1; the catalyst in the catalyst tank 2-4 is sent into an aeration tank 2-1 through the catalyst feeding valve 2-5 and the catalyst feeding pump 2-6 in sequence; the electrolytic gas generated in the electrocatalytic oxidation section 3 is sent into the aeration tank 2-1 through the aeration pump 2-3; in the aeration tank 2-1, under the action of aeration, the filtered clear liquid and the catalyst are fully and uniformly mixed, and simultaneously, the catalytic components in the electrolytic gas are fully absorbed, so that pretreated organic wastewater, aerated sludge and harmless gas are obtained; discharging the aerated sludge through a blowdown valve 2-2 of the aeration tank and sending the sludge to treatment; emptying the residual harmless gas;
the pretreated organic wastewater in the aeration tank 2-1 enters the plate frame electrolytic tank 3-3 through the electrolytic tank water feed pump 3-2, and organic matters in the wastewater begin to decompose under the action of electrocatalytic oxidation; the energy for electrocatalytic oxidation in the plate-frame electrolytic cell 3-3 is provided by the direct-current power supply 3-1; the pre-decomposed organic wastewater enters the fluidized bed electrolytic bath 3-5 through the fluidized bed electrolytic liquid inlet valve 3-4, and the organic wastewater is deeply decomposed under the action of the granular catalyst; the energy for electrocatalytic oxidation in the fluidized bed electrolytic bath 3-5 is provided by the direct current power supply 3-1; gas generated by the deeply treated organic wastewater along with electrolysis enters the gas-liquid separation tank 3-7 through the fluidized bed electrolysis liquid outlet valve 3-6 to obtain purified liquid and electrolysis gas; electrolytic gas is sent into the aeration tank 2-1 through the aeration pump 2-3; purified liquid sequentially passes through the separation tank liquid discharge valve 3-8 and the adjusting tank liquid feeding pump 4-1 and enters the adjusting tank 4-2; the medicament in the medicament tank 4-3 sequentially passes through the medicament feeding valve 4-4 and the medicament feeding pump 4-5 and enters the regulating tank 4-2; the purified liquid in the adjusting tank 4-2 is adjusted to be in a proper PH range under the use of the medicament, and after meeting the water quality standard, the purified liquid passes through a liquid discharge valve 4-6 of the adjusting tank and a purified liquid delivery pump 4-7 in sequence and is discharged after reaching the standard.
The direct current power supply 3-1 has the function of cutting off the power supply when the instantaneous current is too high; the plate frame electrolytic tank 3-3 and the fluidized bed electrolytic tank 3-5 adopt a pulse electrolysis mode, the signal period is 3 seconds, and the duty ratio is 0.25.
One of the features of the present invention is: the catalyst in the aeration working section 2 is soluble chloride solution, and the adding amount of the catalyst is 0.1-2% of the mass of the organic wastewater; the aeration valve is a jet device and/or an aeration disc.
The invention is characterized in that: liquid diversion ports which are diagonally arranged are arranged in the plate frame electrolytic cell 3-3, water flow is of a series structure, and current is of a parallel structure.
The invention is characterized in that: the anode in the plate-frame electrolytic cell 3-3 adopts one of a rare noble metal coating titanium electrode, a lead and lead alloy electrode, a graphite electrode, a boron-doped diamond electrode, a titanium suboxide electrode and the like; the cathode adopts one of a stainless steel electrode, a titanium electrode, a nickel electrode, a graphite electrode, an aluminum electrode and the like; the distance between the anode and the cathode is 2 mm-100 mm; the anode current density is 50-800A/m2。
The invention is characterized in that: the anode in the fluidized bed electrolytic bath 3-5 adopts one of rare noble metal coating titanium electrode, lead and lead alloy electrode, graphite electrode, boron-doped diamond electrode, titanium suboxide electrode and the like; the cathode adopts one of a stainless steel electrode, a titanium electrode, a nickel electrode, a graphite electrode, an aluminum electrode and the like; the distance between the anode and the cathode is 2 mm-100 mm; the particle phase catalyst substrate is active carbon or zeolite molecular sieve, and the loaded catalytic component is one or more of ruthenium, iridium, tantalum, lead, manganese, cobalt, lanthanum, cerium, titanium and oxides of the materials; the particle size of the catalyst is 0.1 mm-5.0 mm; the anode current density is 50-2000A/m2。
The fifth characteristic of the invention is: the fluidized bed electrolytic tank 3-5 is provided with a porous liquid distribution plate, and the opening rate is 3% -15%; the operating linear velocity of the fluidized liquid is 0.1-5.0 m/min, and the bed expansion rate is 1.1-5.0.
The invention is characterized in that: in the fluidized bed electrolytic tank 3-5, the surface of the anode is designed with protrusions, the height of the protrusions is 0.2-0.5 mm, and the coverage rate of the protrusions is 20% -40%.
The invention is characterized in that: and a reticular porous plate is arranged in the fluidized bed electrolytic tank 3-5 and is used for covering the particle phase catalyst to prevent the particle phase catalyst from being taken away by fluid and influencing the catalytic effect. The aperture of the reticular porous plate is smaller than the particle size of the particle phase catalyst so as to ensure that the particle phase catalyst can be netted.
The invention is characterized in that: the medicament in the water quality adjusting section 4 is alkaline solution, and the addition amount of the medicament is 0.01-0.1% of the mass of the treated water body.
The rare and precious metals in the invention are one or more of platinum, ruthenium, iridium, tantalum, tin, antimony and manganese.
The electrodes used in the present invention are all commercially available.
In the invention, when the catalyst is added, the mass of the soluble chloride in the soluble chloride solution is calculated; when the amount of the chemical to be added is calculated, the amount is calculated based on the mass of the alkaline substance in the alkaline solution.
In the present invention, the anode can be subjected to sand blasting treatment to form protrusions on the surface of the anode, and abrasion of the anode by the particulate electrode catalyst can be effectively suppressed.
Compared with the prior art, the invention has the following outstanding advantages:
(1) removing solid suspended matters in the organic wastewater through gravity settling and filtering equipment to realize wastewater pre-purification;
(2) the full mixing of the catalyst and the organic wastewater is realized through aeration treatment, and the catalytic components in the electrolytic gas are effectively utilized;
(3) efficient cracking of organic matters in the wastewater is realized through plate-frame electrolysis series-coupled fluidized bed three-dimensional electrolysis;
(4) the alkalinity of the hyaluronic acid is adjusted by adding a medicament, so that the discharge after reaching the standard is realized;
(5) in the fluidized bed electrolytic cell, the surface of the anode is provided with protrusions, the height of the protrusions is 0.2-0.5 mm, the coverage rate of the protrusions is 20% -40%, and the abrasion of the particle electrodes to the anode can be effectively inhibited;
(6) liquid diversion ports which are arranged diagonally are arranged in the plate frame electrolytic cell, and wastewater flows through the diversion ports in series, so that mass transfer is enhanced, and the cracking efficiency is improved.
The invention efficiently combines plate-frame electrolysis and fluidized bed electrolysis, strengthens mass transfer, improves the electrode area and further realizes the efficient decomposition and removal of organic matters. The invention is suitable for large-scale and continuous treatment of organic wastewater, and has the advantages of high efficiency, low energy consumption, no pollution, good economy and the like.
Drawings
FIG. 1 is a schematic configuration diagram of a liquid-solid fluidized bed three-dimensional electrocatalytic oxidation treatment system for organic wastewater.
Reference numerals:
1, a filtering section:
1-1 gravity settling tank 1-2 settling tank blow-down valve
1-3 filter water inlet pump 1-4 filter
1-5 filter blow-down valves;
2, aeration section:
2-1 aeration tank 2-2 aeration tank blowdown valve
2-3 aeration pump 2-4 catalyst tank
2-5 catalyst feed valves 2-6 catalyst feed pumps;
3, an electrocatalytic oxidation section:
3-1 DC power supply 3-2 electrolytic tank water-feeding pump
3-3 plate frame electrolytic bath 3-4 fluidized bed electrolysis liquid inlet valve
3-6 fluidized bed electrolytic liquid outlet valve of 3-5 fluidized bed electrolytic bath
3-7 gas-liquid separation tank 3-8 separation tank drain valve;
4, water quality adjusting section:
4-1 adjusting tank liquid feeding pump 4-2 adjusting tank
4-3 medicament tank 4-4 medicament feeding valve
4-5 medicament feeding pump 4-6 regulating tank drain valve
4-7 purifying liquid conveying pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. It should be noted that the examples are only for illustrating the technical solutions of the present invention, and not for limiting the same. FIG. 1 is a schematic diagram of a system and a method for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed according to the invention.
Example 1
With reference to fig. 1, the system for treating organic wastewater by three-dimensional electrocatalytic oxidation in a liquid-solid fluidized bed used in this embodiment includes a filtering section 1, an aeration section 2, an electrocatalytic oxidation section 3, and a water quality adjusting section 4;
the filtering section 1 comprises a gravity settling tank 1-1, a settling tank blow-down valve 1-2, a filter water inlet pump 1-3, a filter 1-4 and a filter blow-down valve 1-5;
the aeration section 2 comprises an aeration tank 2-1, an aeration tank blowdown valve 2-2, an aeration pump 2-3, a catalyst tank 2-4, a catalyst feed valve 2-5 and a catalyst feed pump 2-6;
the electrocatalytic oxidation chemical section 3 comprises a direct-current power supply 3-1, an electrolytic bath water feed pump 3-2, a plate frame electrolytic bath 3-3, a fluidized bed electrolytic liquid inlet valve 3-4, a fluidized bed electrolytic bath 3-5, a fluidized bed electrolytic liquid outlet valve 3-6, a gas-liquid separation tank 3-7 and a separation tank liquid outlet valve 3-8;
the water quality adjusting section 4 comprises an adjusting tank liquid feeding pump 4-1, an adjusting tank 4-2, a medicament tank 4-3, a medicament feeding valve 4-4, a medicament feeding pump 4-5, an adjusting tank liquid discharging valve 4-6 and a purifying liquid conveying pump 4-7;
the liquid inlet of the gravity settling tank 1-1 is connected with an organic wastewater main pipe; a sewage outlet at the bottom of the gravity settling tank 1-1 is connected with a feed inlet of a sewage valve 1-2 of the settling tank through a pipeline; the discharge hole of the sedimentation tank blow-down valve 1-2 is connected with a sludge treatment main pipe; a vertical liquid baffle plate is arranged in the gravity settling tank 1-1; the water outlet of the gravity settling tank 1-1 is connected with the water inlet of the filter water inlet pump 1-3 through a pipeline; the water outlet of the filter water inlet pump 1-3 is connected with the water inlet of the filter 1-4 through a pipeline; a filter screen or quartz sand is filled in the filter 1-4; the drain outlet at the bottom of the filter 1-4 is connected with the feed inlet of the filter drain valve 1-5 through a pipeline; the discharge ports of the filter blow-down valves 1-5 are connected with a sludge treatment main pipe; the water outlet of the filter 1-4 is connected with the water inlet of the aeration tank 2-1 through a pipeline;
the air outlet of the aeration tank 2-1 is connected with a harmless gas emptying main pipe; the catalyst feeding port of the aeration tank 2-1 is connected with the discharging port of the catalyst feeding pump 2-6 through a pipeline; the feed inlet of the catalyst feed pump 2-6 is connected with the discharge outlet of the catalyst feed valve 2-5 through a pipeline; the feed inlet of the catalyst feed valve 2-5 is connected with the discharge outlet of the catalyst tank 2-4 through a pipeline; the liquid outlet of the aeration tank 2-1 is connected with the water inlet of the water feeding pump 3-2 of the electrolytic bath through a pipeline; a vertical guide plate is arranged in the aeration tank 2-1; a sewage outlet at the bottom of the aeration tank 2-1 is connected with a feed inlet of a sewage valve 2-2 of the aeration tank through a pipeline; the discharge hole of the aeration tank blow-down valve 2-2 is connected with a sludge treatment main pipe; an aeration valve is arranged in the aeration tank 2-1; the air inlet of the aeration tank 2-1 is connected with the air outlet of the aeration pump 2-3 through a pipeline; the air inlet of the aeration pump 2-3 is connected with the air outlet of the gas-liquid separation tank 3-7 through a pipeline;
the water outlet of the water feeding pump 3-2 of the electrolytic tank is connected with the water inlet of the plate frame electrolytic tank 3-3 through a pipeline; liquid diversion ports which are arranged diagonally are arranged in the plate frame electrolytic cell 3-3; the water outlet of the plate frame electrolytic bath 3-3 is connected with the liquid inlet of the fluidized bed electrolytic liquid inlet valve 3-4 through a pipeline; the anode of the plate frame electrolytic tank 3-3 is connected with the anode of the fluidized bed electrolytic tank 3-5 through a conductive copper beam; the cathode of the plate frame electrolytic cell 3-3 is connected with the cathode of the direct current power supply 3-1 through a conductive copper beam; the liquid outlet of the fluidized bed electrolytic liquid inlet valve 3-4 is connected with the liquid inlet of the fluidized bed electrolytic bath 3-5 through a pipeline; a granular phase catalyst is arranged in the fluidized bed electrolytic tank 3-5; the anode of the fluidized bed electrolytic bath 3-5 is connected with the anode of the direct current power supply 3-1 through a conductive copper beam; the cathode of the fluidized bed electrolytic bath 3-5 is connected with the cathode of the direct current power supply 3-1 through a conductive copper beam; the liquid outlet of the fluidized bed electrolytic bath 3-5 is connected with the liquid inlet of the fluidized bed electrolytic liquid outlet valve 3-6 through a pipeline; the liquid outlet of the fluidized bed electrolysis liquid outlet valve 3-6 is connected with the liquid inlet of the gas-liquid separation tank 3-7 through a pipeline; the liquid outlet of the gas-liquid separation tank 3-7 is connected with the liquid inlet of a liquid discharge valve 3-8 of the separation tank through a pipeline; the liquid outlet of the liquid discharge valve 3-8 of the separation tank is connected with the liquid inlet of the liquid feeding pump 4-1 of the adjusting tank through a pipeline;
the liquid outlet of the adjusting tank liquid feeding pump 4-1 is connected with the liquid inlet of the adjusting tank 4-2 through a pipeline, and the medicament inlet of the adjusting tank 4-2 is connected with the medicament outlet of the medicament feeding pump 4-5 through a pipeline; a liquid inlet of the medicament feeding pump 4-5 is connected with a liquid outlet of the medicament feeding valve 4-4 through a pipeline; the liquid inlet of the medicament feeding valve 4-4 is connected with the liquid outlet of the medicament tank 4-3 through a pipeline; a stirring paddle is arranged in the adjusting tank 4-2; the water outlet of the adjusting tank 4-2 is connected with the water inlet of the adjusting tank drain valve 4-6 through a pipeline; the water outlet of the adjusting tank drain valve 4-6 is connected with the water inlet of the purified liquid delivery pump 4-7 through a pipeline; the water outlets of the purified liquid delivery pumps 4-7 are connected with the standard discharge main pipe.
The plate frame electrolytic tank 3-3 is provided with a heat exchange jacket; the fluidized bed electrolytic tank 3-5 is provided with a heat exchange jacket; and a liquid outlet at the top of the fluidized bed electrolytic tank 3-5 is provided with a porous filtering membrane. The plate frame electrolytic tank 3-3 is provided with a heat exchange jacket, and a heat exchange medium is water or air; the fluidized bed electrolytic tank 3-5 is provided with a heat exchange jacket, and a heat exchange medium is water or air; a liquid outlet at the top of the fluidized bed electrolytic bath 3-5 is provided with a porous filtering membrane; the pore size is less than 100 microns. Heat is generated during the electrolysis process, which causes the electrolyte to heat up and be removed in the form of a heat exchange jacket. The porous filtering membrane is arranged, so that the catalyst can be prevented from being flushed out of the reactor.
Example 2
In this embodiment, the method for treating organic wastewater by using three-dimensional electrocatalytic oxidation in a liquid-solid fluidized bed in the system of embodiment 1 includes the following steps:
sending the organic wastewater into a gravity settling tank 1-1, and performing gravity settling to obtain supernatant and sludge; the sludge is discharged through a blow-down valve 1-2 of a settling tank and is sent for treatment; the supernatant is sent into a filter 1-4 through a filter water inlet pump 1-3 to obtain filtered supernatant and filtered sludge; the filtered sludge is discharged through a filter blow-down valve 1-5 and is sent for treatment; the filtered clear liquid is sent into an aeration tank 2-1; the catalyst in the catalyst tank 2-4 is sent into the aeration tank 2-1 through a catalyst feeding valve 2-5 and a catalyst feeding pump 2-6 in sequence; electrolytic gas generated by the electrocatalytic oxidation section 3 is sent into an aeration tank 2-1 through an aeration pump 2-3; in the aeration tank 2-1, under the action of aeration, the filtered clear liquid and the catalyst are fully and uniformly mixed, and simultaneously, the catalytic components in the electrolytic gas are fully absorbed to obtain pretreated organic wastewater, aerated sludge and harmless gas; the aerated sludge is discharged through a blowdown valve 2-2 of the aeration tank and is sent for treatment; emptying the residual harmless gas;
the pretreated organic wastewater in the aeration tank 2-1 enters a plate-frame electrolytic tank 3-3 through an electrolytic tank feed pump 3-2, and organic matters in the wastewater begin to decompose under the action of electrocatalytic oxidation; the energy for electrocatalytic oxidation in the plate-frame electrolytic cell 3-3 is provided by a direct-current power supply 3-1; the organic wastewater after pre-decomposition enters a fluidized bed electrolytic bath 3-5 through a fluidized bed electrolytic liquid inlet valve 3-4, and the organic wastewater is deeply decomposed under the action of a particle catalyst; the energy for electrocatalytic oxidation in the fluidized bed electrolytic bath 3-5 is provided by a direct current power supply 3-1; the gas generated by the organic wastewater after advanced treatment along with electrolysis enters a gas-liquid separation tank 3-7 through a fluidized bed electrolysis liquid outlet valve 3-6 to obtain purified liquid and electrolysis gas; the electrolytic gas is sent into an aeration tank 2-1 through an aeration pump 2-3; purified liquid sequentially passes through a separation tank liquid discharge valve 3-8 and a regulating tank liquid feeding pump 4-1 and enters a regulating tank 4-2; the medicament in the medicament tank 4-3 sequentially passes through a medicament feeding valve 4-4 and a medicament feeding pump 4-5 and enters the regulating tank 4-2; the purified liquid in the adjusting tank 4-2 is adjusted to be in a proper PH range under the use of the medicament, and after meeting the water quality standard, the purified liquid is discharged after reaching the standard after sequentially passing through a drain valve 4-6 of the adjusting tank and a purified liquid delivery pump 4-7. The direct current power supply 3-1 has the function of cutting off the power supply when the instantaneous current is too high; the plate frame electrolytic tank 3-3 and the fluidized bed electrolytic tank 3-5 adopt a pulse electrolysis mode, the signal period is 3 seconds, and the duty ratio is 0.25.
Example 3
In the embodiment, the activated carbon washing wastewater of a certain enterprise is taken as a treatment object, and the treatment capacity is 10m3The initial value of COD is 8000. In the aeration section 2, the catalyst is sodium chloride solution, the adding amount of the catalyst is 2 percent of the mass of the organic wastewater, and the aeration valve is a jet device; liquid diversion ports which are arranged diagonally are arranged in the plate frame electrolytic cell 3-3, the water flow is in a series structure, and the current is in a parallel structure; in the plate-frame electrolytic tank 3-3, the anode adopts a rare noble metal coating titanium electrode, and the cathode adopts a titanium electrode; the distance between the anode and the cathode is 2 mm; the anode current density is 800A/m2(ii) a In the fluidized bed electrolytic tank 3-5, the anode adopts a rare noble metal coating titanium electrode, the cathode adopts a titanium electrode, and the distance between the anode and the cathode is 2 mm; the particle phase catalyst substrate is active carbon, and the loaded catalytic component is one or a mixture of more of ruthenium, iridium, tantalum, lead, manganese, cobalt, lanthanum, cerium, titanium and oxides of the materials; the catalyst particle size was 0.1 mm; the anode current density is 50A/m2. A porous liquid distribution plate is arranged in the fluidized bed electrolytic tank 3-5, and the aperture ratio is 3%; the operating linear velocity of the fluidized liquid is 5.0m/min, and the bed expansion rate is 5.0. In the fluidized bed electrolytic tank 3-5, the surface of the anode is designed with protrusions, the height of the protrusions is 0.2mm, and the coverage rate of the protrusions is 40%. The medicament in the water quality adjusting section 4 is sodium hydroxide solution, and the addition amount of the medicament is 0.01 percent of the mass of the treated water body. The organic wastewater is treated by the stages of filtering, aeration, electrocatalytic oxidation and water quality regulation, and the COD removal rate is 87.5 percent.
Example 4
The embodiment takes bottle washing wastewater of a certain enterprise as a treatment object, and the treatment capacity is 5m3The initial COD value was 5000. In the aeration section 2, the catalyst is calcium chloride solution, the adding amount of the catalyst is 0.1 percent of the mass of the organic wastewater, and an aeration disc is adopted for aeration; liquid diversion ports which are arranged diagonally are arranged in the plate frame electrolytic cell 3-3, the water flow is in a series structure, and the current is in a parallel structure; in the plate-frame electrolytic tank 3-3, the anode adopts a lead alloy electrode, and the cathode adopts a stainless steel electrode; the distance between the cathode and the anode is 100 mm; the anode current density is 50A/m2(ii) a In the fluidized bed electrolytic tank 3-5, the anode adopts a lead alloy electrode, the cathode adopts a stainless steel electrode, and the distance between the cathode and the anode is 100 mm; the particle phase catalyst matrix isThe zeolite molecular sieve is a mixture of oxides of ruthenium, iridium, tantalum, lead, manganese, cobalt, lanthanum, cerium, titanium and the like as a load catalytic component; the catalyst particle size was 5 mm; the anode current density is 2000A/m2. A porous liquid distribution plate is arranged in the fluidized bed electrolytic tank 3-5, and the aperture ratio is 15%; the operating linear velocity of the fluidized liquid is 0.1m/min, and the bed expansion rate is 1.1. In the fluidized bed electrolytic tank 3-5, the surface of the anode is designed with protrusions, the height of the protrusions is 0.5mm, and the coverage rate of the protrusions is 20%. The medicament in the water quality adjusting section 4 is sodium carbonate solution, and the addition amount of the medicament is 0.1 percent of the mass of the treated water body. The organic wastewater is treated by filtering, aerating, electrocatalytic oxidation and water quality adjusting sections, and the COD removal rate is 95 percent.
Example 5
In the embodiment, landfill leachate of a certain enterprise is taken as a treatment object, and the treatment capacity is 1m3The initial value of COD is 1000. In the aeration section 2, the catalyst is sodium chloride solution, the adding amount of the catalyst is 0.5 percent of the mass of the organic wastewater, and an aeration disc is adopted for aeration; liquid diversion ports which are arranged diagonally are arranged in the plate frame electrolytic cell 3-3, the water flow is in a series structure, and the current is in a parallel structure; the anode in the plate-frame electrolytic cell 3-3 adopts a graphite electrode and a cathode graphite electrode; the distance between the anode and the cathode is 10 mm; the anode current density is 200A/m2(ii) a In the fluidized bed electrolytic tank 3-5, a graphite electrode is adopted as an anode, a graphite electrode is adopted as a cathode, and the distance between the anode and the cathode is 10 mm; the particle phase catalyst substrate is active carbon, and the loaded catalytic component is a mixture of oxides of ruthenium, iridium, tantalum, lead and the like; the catalyst particle size was 0.5 mm; the anode current density is 200A/m2. A porous liquid distribution plate is arranged in the fluidized bed electrolytic tank 3-5, and the aperture ratio is 10%; the operating linear velocity of the fluidized liquid is 0.8m/min, and the bed expansion rate is 1.9. In the fluidized bed electrolytic tank 3-5, the surface of the anode is designed with protrusions, the height of the protrusions is 0.3mm, and the coverage rate of the protrusions is 30%. The medicament in the water quality adjusting section 4 is sodium bicarbonate solution, and the addition amount of the medicament is 0.05 percent of the mass of the treated water body. The organic wastewater is treated by filtering, aerating, electrocatalytic oxidation and water quality adjusting sections, and the COD removal rate is 90 percent.
Example 6
The embodiment takes printing and dyeing wastewater of a certain enterprise asTarget of treatment, treatment amount 15m3Per, the initial value of COD was 10000. In the aeration section 2, the catalyst is sodium chloride solution, the adding amount of the catalyst is 1.0 percent of the mass of the organic wastewater, and an ejector is adopted for aeration; liquid diversion ports which are arranged diagonally are arranged in the plate frame electrolytic cell 3-3, the water flow is in a series structure, and the current is in a parallel structure; in the plate-frame electrolytic cell 3-3, a boron-doped diamond electrode is adopted as an anode, and a nickel electrode is adopted as a cathode; the distance between the anode and the cathode is 10 mm; the current density of the anode is 300A/m2(ii) a In the fluidized bed electrolytic bath 3-5, a boron-doped diamond electrode is adopted as an anode, a nickel electrode is adopted as a cathode, and the distance between the anode and the cathode is 10 mm; the particle phase catalyst substrate is a zeolite molecular sieve, and the loaded catalytic component is a mixture of oxides of manganese, cobalt, lanthanum, cerium, titanium and the like; the catalyst particle size is 1 mm; the current density of the anode is 300A/m2. A porous liquid distribution plate is arranged in the fluidized bed electrolytic tank 3-5, and the aperture ratio is 8%; the operating linear velocity of the fluidized liquid is 1.5m/min, and the bed expansion rate is 2.1. In the fluidized bed electrolytic tank 3-5, the surface of the anode is designed with protrusions, the height of the protrusions is 0.35mm, and the coverage rate of the protrusions is 35%. The medicament in the water quality adjusting section 4 is sodium hydroxide solution, and the addition amount of the medicament is 0.05 percent of the mass of the treated water body. The organic wastewater is treated by filtering, aerating, electrocatalytic oxidation and water quality adjusting sections, and the COD removal rate is 92 percent.
Example 7
In the embodiment, the waste water of a certain garbage transfer station is taken as a treatment object, and the treatment capacity is 1m3The initial COD value was 3000/h. In the aeration section 2, the catalyst is sodium chloride solution, the adding amount of the catalyst is 1.0 percent of the mass of the organic wastewater, and an ejector is adopted for aeration; liquid diversion ports which are arranged diagonally are arranged in the plate frame electrolytic cell 3-3, the water flow is in a series structure, and the current is in a parallel structure; in the plate-frame electrolytic cell 3-3, a titanium suboxide electrode is adopted as an anode, and an aluminum electrode is adopted as a cathode; the distance between the anode and the cathode is 10 mm; the current density of the anode is 300A/m2(ii) a In the fluidized bed electrolytic tank 3-5, a titanium suboxide electrode is adopted as an anode, an aluminum electrode is adopted as a cathode, and the distance between the anode and the cathode is 10 mm; the granular phase catalyst substrate is active carbon, and the loaded catalytic component is a mixture of oxides of manganese, cobalt, lanthanum, cerium, titanium and the like; the catalyst particle size was 2 mm; anode current ofThe density is 400A/m2. A porous liquid distribution plate is arranged in the fluidized bed electrolytic tank 3-5, and the opening rate is 9%; the operating linear velocity of the fluidized liquid is 2.5m/min, and the bed expansion rate is 2.8. In the fluidized bed electrolytic tank 3-5, the surface of the anode is designed with protrusions, the height of the protrusions is 0.35mm, and the coverage rate of the protrusions is 35%. The medicament in the water quality adjusting section 4 is sodium hydroxide solution, and the addition amount of the medicament is 0.05 percent of the mass of the treated water body. The organic wastewater is treated by filtering, aerating, electrocatalytic oxidation and water quality adjusting sections, and the COD removal rate is 97 percent.
The invention has not been described in detail and is within the skill of the art.
The present invention may be embodied in many different forms and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A system for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed is characterized by comprising a filtering section (1), an aeration section (2), an electrocatalytic oxidation section (3) and a water quality adjusting section (4);
the filtering section (1) comprises a gravity settling tank (1-1), a settling tank blow-down valve (1-2), a filter water inlet pump (1-3), a filter (1-4) and a filter blow-down valve (1-5);
the aeration section (2) comprises an aeration tank (2-1), an aeration tank blowdown valve (2-2), an aeration pump (2-3), a catalyst tank (2-4), a catalyst feeding valve (2-5) and a catalyst feeding pump (2-6);
the electrocatalytic oxidation chemical section (3) comprises a direct-current power supply (3-1), an electrolytic bath water supply pump (3-2), a plate-frame electrolytic bath (3-3), a fluidized bed electrolysis liquid inlet valve (3-4), a fluidized bed electrolytic bath (3-5), a fluidized bed electrolysis liquid outlet valve (3-6), a gas-liquid separation tank (3-7) and a separation tank liquid outlet valve (3-8);
the water quality adjusting section (4) comprises an adjusting tank liquid feeding pump (4-1), an adjusting tank (4-2), a medicament tank (4-3), a medicament feeding valve (4-4), a medicament feeding pump (4-5), an adjusting tank liquid discharging valve (4-6) and a purified liquid conveying pump (4-7);
the liquid inlet of the gravity settling tank (1-1) is connected with an organic wastewater main pipe; a sewage outlet at the bottom of the gravity settling tank (1-1) is connected with a feed inlet of the settling tank sewage valve (1-2) through a pipeline; the discharge hole of the sedimentation tank blow-down valve (1-2) is connected with a sludge treatment main pipe; a vertical liquid baffle plate is arranged in the gravity settling tank (1-1); the water outlet of the gravity settling tank (1-1) is connected with the water inlet of the filter water inlet pump (1-3) through a pipeline; the water outlet of the filter water inlet pump (1-3) is connected with the water inlet of the filter (1-4) through a pipeline; a filter screen is arranged in the filter (1-4) or quartz sand is filled in the filter; a sewage discharge port at the bottom of the filter (1-4) is connected with a feed inlet of the filter sewage discharge valve (1-5) through a pipeline; the discharge hole of the filter blow-down valve (1-5) is connected with a sludge treatment main pipe; the water outlet of the filter (1-4) is connected with the water inlet of the aeration tank (2-1) through a pipeline;
the air outlet of the aeration tank (2-1) is connected with a harmless gas emptying header pipe; the catalyst feeding port of the aeration tank (2-1) is connected with the discharging port of the catalyst feeding pump (2-6) through a pipeline; the feed inlet of the catalyst feed pump (2-6) is connected with the discharge outlet of the catalyst feed valve (2-5) through a pipeline; the feed inlet of the catalyst feed valve (2-5) is connected with the discharge outlet of the catalyst tank (2-4) through a pipeline; the liquid outlet of the aeration tank (2-1) is connected with the water inlet of the water feeding pump (3-2) of the electrolytic bath through a pipeline; a vertical guide plate is arranged in the aeration tank (2-1); a sewage outlet at the bottom of the aeration tank (2-1) is connected with a feed inlet of the aeration tank sewage valve (2-2) through a pipeline; the discharge hole of the aeration tank blow-down valve (2-2) is connected with a sludge treatment main pipe; an aeration valve is arranged in the aeration tank (2-1); the air inlet of the aeration tank (2-1) is connected with the air outlet of the aeration pump (2-3) through a pipeline; the air inlet of the aeration pump (2-3) is connected with the air outlet of the gas-liquid separation tank (3-7) through a pipeline;
the water outlet of the electrolytic bath water feed pump (3-2) is connected with the water inlet of the plate frame electrolytic bath (3-3) through a pipeline; liquid diversion ports which are diagonally arranged are arranged in the plate frame electrolytic cell (3-3); the water outlet of the plate frame electrolytic tank (3-3) is connected with the liquid inlet of the fluidized bed electrolytic liquid inlet valve (3-4) through a pipeline; the anode of the plate frame electrolytic tank (3-3) is connected with the anode of the fluidized bed electrolytic tank (3-5) through a conductive copper beam; the cathode of the plate frame electrolytic cell (3-3) is connected with the cathode of the direct current power supply (3-1) through a conductive copper beam; the liquid outlet of the fluidized bed electrolytic liquid inlet valve (3-4) is connected with the liquid inlet of the fluidized bed electrolytic tank (3-5) through a pipeline; a granular phase catalyst is arranged in the fluidized bed electrolytic tank (3-5); the anode of the fluidized bed electrolytic tank (3-5) is connected with the anode of the direct current power supply (3-1) through a conductive copper beam; the cathode of the fluidized bed electrolytic tank (3-5) is connected with the cathode of the direct current power supply (3-1) through a conductive copper beam; the liquid outlet of the fluidized bed electrolytic bath (3-5) is connected with the liquid inlet of the fluidized bed electrolytic liquid outlet valve (3-6) through a pipeline; the liquid outlet of the fluidized bed electrolysis liquid outlet valve (3-6) is connected with the liquid inlet of the gas-liquid separation tank (3-7) through a pipeline; the liquid outlet of the gas-liquid separation tank (3-7) is connected with the liquid inlet of the liquid discharge valve (3-8) of the separation tank through a pipeline; the liquid outlet of the separation tank liquid discharge valve (3-8) is connected with the liquid inlet of the adjusting tank liquid feeding pump (4-1) through a pipeline;
the liquid outlet of the adjusting tank liquid feeding pump (4-1) is connected with the liquid inlet of the adjusting tank (4-2) through a pipeline, and the medicament inlet of the adjusting tank (4-2) is connected with the medicament outlet of the medicament feeding pump (4-5) through a pipeline; a liquid inlet of the medicament feeding pump (4-5) is connected with a liquid outlet of the medicament feeding valve (4-4) through a pipeline; the liquid inlet of the medicament feeding valve (4-4) is connected with the liquid outlet of the medicament tank (4-3) through a pipeline; a stirring paddle is arranged in the adjusting tank (4-2); the water outlet of the adjusting tank (4-2) is connected with the water inlet of the adjusting tank drain valve (4-6) through a pipeline; the water outlet of the regulating tank drain valve (4-6) is connected with the water inlet of the purified liquid delivery pump (4-7) through a pipeline; and the water outlet of the purified liquid delivery pump (4-7) is connected with the standard discharge main pipe.
2. A method for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed based on the system of claim 1, comprising the following steps:
sending the organic wastewater into the gravity settling tank (1-1), and performing gravity settling to obtain supernatant and sludge; the sludge is discharged through a blow-down valve (1-2) of the settling tank and is sent for treatment; the supernatant is sent into the filter (1-4) through the filter water inlet pump (1-3) to obtain filtered supernatant and filtered sludge; the filtered sludge is discharged through the filter blow-down valve (1-5) and is sent for treatment; the filtered clear liquid is sent into the aeration tank (2-1); the catalyst in the catalyst tank (2-4) is sent into an aeration tank (2-1) through the catalyst feeding valve (2-5) and the catalyst feeding pump (2-6) in sequence; electrolytic gas generated by the electrocatalytic oxidation section (3) is sent into the aeration tank (2-1) through the aeration pump (2-3); in the aeration tank (2-1), under the action of aeration, the filtered clear liquid and the catalyst are fully and uniformly mixed, and simultaneously, the catalytic components in the electrolytic gas are fully absorbed, so that pretreated organic wastewater, aerated sludge and harmless gas are obtained; the aerated sludge is discharged through a blowdown valve (2-2) of the aeration tank and is sent for treatment; harmless gas is emptied;
the pretreated organic wastewater in the aeration tank (2-1) enters the plate frame electrolytic tank (3-3) through the electrolytic tank water feeding pump (3-2), and organic matters in the wastewater begin to decompose under the action of electrocatalytic oxidation; the energy for electrocatalytic oxidation in the plate-frame electrolytic cell (3-3) is provided by the direct current power supply (3-1); the pre-decomposed organic wastewater enters the fluidized bed electrolytic bath (3-5) through the fluidized bed electrolytic liquid inlet valve (3-4), and the organic wastewater is deeply decomposed under the action of a particle catalyst; the energy source for the electrocatalytic oxidation in the fluidized bed electrolytic bath (3-5) is provided by the direct current power supply (3-1); gas generated by the deeply treated organic wastewater along with electrolysis enters the gas-liquid separation tank (3-7) through the fluidized bed electrolysis liquid outlet valve (3-6) to obtain purified liquid and electrolysis gas; electrolytic gas is sent into the aeration tank (2-1) through the aeration pump (2-3); purified liquid sequentially passes through the separation tank liquid discharge valve (3-8) and the adjusting tank liquid feeding pump (4-1) and enters the adjusting tank (4-2); the medicament in the medicament tank (4-3) sequentially passes through the medicament feeding valve (4-4) and the medicament feeding pump (4-5) and enters the regulating tank (4-2); the purified liquid in the adjusting tank (4-2) is adjusted to a proper PH range under the use of the medicament, and after meeting the water quality standard, the purified liquid passes through the adjusting tank drain valve (4-6) and the purified liquid delivery pump (4-7) in sequence and is discharged after reaching the standard.
3. The method for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed according to claim 2, wherein the catalyst in the aeration section (2) is a soluble chloride solution, and the addition amount of the catalyst is 0.1-2% of the mass of the organic wastewater; the aeration valve is one or two of a jet device and an aeration disc.
4. The method for treating organic wastewater by three-dimensional electrocatalytic oxidation through a liquid-solid fluidized bed according to claim 2, wherein liquid diversion ports arranged diagonally are arranged in the plate-frame electrolytic cell (3-3), water flow is in a series structure, and current is in a parallel structure.
5. The method for treating organic wastewater by three-dimensional electrocatalytic oxidation through a liquid-solid fluidized bed according to claim 2, wherein the plate-frame electrolysis cell (3-3) is provided with a heat exchange jacket, and the heat exchange medium is water or air; the fluidized bed electrolytic tank (3-5) is provided with a heat exchange jacket, and a heat exchange medium is water or air; a liquid outlet at the top of the fluidized bed electrolytic tank (3-5) is provided with a porous filtering membrane; the pore size is less than 100 microns.
6. The method for treating organic wastewater by three-dimensional electrocatalytic oxidation through a liquid-solid fluidized bed according to claim 2, wherein the plate-and-frame electrolytic cell (3-3) is characterized in that the anode adopts one of a rare precious metal coating titanium electrode, a lead and lead alloy electrode, a graphite electrode, a boron-doped diamond electrode and a titanium suboxide electrode; the cathode adopts one of a stainless steel electrode, a titanium electrode, a nickel electrode, a graphite electrode and an aluminum electrode; the distance between the anode and the cathode is 2 mm-100 mm; the anode current density is 50-800A/m2。
7. The liquid-solid fluidized bed of claim 2 in three dimensionsThe method for treating the organic wastewater by electrocatalytic oxidation is characterized in that an anode in the fluidized bed electrolytic cell (3-5) adopts one of a rare and precious metal coating titanium electrode, a lead and lead alloy electrode, a graphite electrode, a boron-doped diamond electrode and a titanium suboxide electrode; the cathode adopts one of a stainless steel electrode, a titanium electrode, a nickel electrode, a graphite electrode and an aluminum electrode; the distance between the anode and the cathode is 2 mm-100 mm; the substrate of the granular phase catalyst is active carbon or zeolite molecular sieve, and the loaded catalytic component is one or more of ruthenium, iridium, tantalum, lead, manganese, cobalt, lanthanum, cerium, titanium and oxides thereof; the particle size of the catalyst is 0.1 mm-5.0 mm; the anode current density is 50-2000A/m2。
8. The method for treating organic wastewater by three-dimensional electrocatalytic oxidation through a liquid-solid fluidized bed according to claim 2, wherein a porous liquid distribution plate is arranged in the fluidized bed electrolytic tank (3-5), and the opening rate is 3-15%; the operating linear velocity of the fluidized liquid is 0.1-5.0 m/min, and the bed expansion rate is 1.1-5.0.
9. The method for treating organic wastewater by three-dimensional electrocatalytic oxidation through a liquid-solid fluidized bed according to claim 2, wherein in the fluidized bed electrolytic tank (3-5), the surface of the anode is provided with protrusions, the height of the protrusions is 0.2-0.5 mm, and the coverage rate of the protrusions is 20% -40%.
10. The method for treating organic wastewater by three-dimensional electrocatalytic oxidation of a liquid-solid fluidized bed according to claim 2, wherein the medicament in the water quality adjusting section (4) is an alkaline solution, and the addition amount of the medicament is 0.01-0.1% of the mass of the treated water body.
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| CN113096847A (en) * | 2021-03-31 | 2021-07-09 | 国网山东省电力公司电力科学研究院 | Conductive particles, and equipment and process for treating discharged wastewater of direct current converter station by using conductive particles |
| CN113754149A (en) * | 2021-09-28 | 2021-12-07 | 天津工业大学 | Spherical porous filler and electrolytic oxidation system for treating organic matters in high-salt water |
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